of detroit



June 24, 1930." l T. P. CHASE A '1,768,350

l' OIL FILTER Filed D90. 24, 1926 ized by the feature Patented June 24, 1930 UNITED STATES, PATENT OFFICE THERON' P. CHASE, OF DETROIT, MICHIGAN, ASSIGNOR TO GENERAD MOTORS RE SEARCH CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION 0F DELAWARE OIL FILTER l Application nled December v24:, 1926. Serial No. 158,974.

This invention is an improvement on av type of filter disclosed and claimed, in the application of C. R. Short, Ser. No. 125,451, led July 28th, 1926. In this design of filter the fiuidis forced between sheets of aper or other fibrous material in contrast to t ve usual methods of filtration in which the fluid is passed through sheets or layers of filtering medium.

It is the object of my invention to provide a filter of this general type in which a greatly increased filtering surface is afforded.. I have accomplished this by providing a plurality of passages in parallel in the body of the filter through which fluid is supplied to the filtering medium and similarpassages in parallel through which filtered oil is discharged from the filtering medium.

I have also embodied in my improved filter a pressure operated by-pass characterthat when the filter becomes clogged an unobstructed passage is provided through rather 'than around the filter.

In the drawings:

Fig. 1 is a section through my improvedfilter but with the filter body shown in elevation;

Fig. 2 is a view taken approximately on line 2-2 of Fig. 1;

Fig. 3 is a plan View of one of the sheets of filtering material;

Fig. 4 is a section taken on line ,/1--4 of Fig. 1, Vlooking in the direction of the arrows;

Fig. 5 is a view similar to Fig. 1 showing a modification;

Fig. 6 is a view taken approximately on line 6--6 of Fig. 5.

The form shown in Figs. 1 to 4 will first be described. The filter body consists of a stack of sheets 6, such as shown in Fig. 8,.v

clamped between bottom plate 8 and top plate 10 by means of bolts 12 passing through alined apertures provided in the sheets and plates as shown on the drawing. It will be noted that the apertures provided in the filter sheets and. in the top plate are larger than is necessary to accommodate the .at the bottom by the clamping bolts while the apertures provided in the bottom plate are merely of sufficient size to receive the bolts.- By this arrangement, four passages 14 are provided closed late 8 and o en at the top around the bo ts 12. The p ates 8 and 10 andthe sheets are likewise provided with alined passages 16 closed at the top by means of spring pressed fiap valves of any suitable construction. The valves herein disclosed Vconsist of a leaf sprin 20 centrally secured to the up er side o plate 10 and carrying pads 22 o felt or the like in sealing engagement with the top of the plate.

The filter body thus described fits within receptacle 24 provided with bottom closure 26 having a port 28 through which fluid may e vided at the top of the case 24. t will be t noted that thev filter body fits within the receptacle 24 in spaced relation to the walls thereof providing an annular channel 34 to permit the fluid to have access to the filterl body.

The filter operates as follows:

Oil or other fluid supplied to the filter through port28 surroundsthe filter and at the same time fills the passages 16 and thence 1 works its way through the ltering medium by passing between the layers of paper or other fibrous material of which it is composed, finding egress through passages 14 finto the upper portion of the case and thence outwardly through port 28.

Where the filter is used in an automobile engine lubricating system, it is desirable that should the filter become clogged the circulation of oil will not stop. With this apparatus the clogging of the filter permits the pressure to build up toa point where the tension of the spring 2O oil thereafter discharges directly through the passages 16 into the upper compartment.

.In Figs. 5 and 6, I have shown a slightly modified construction in which three Qpasis overcome and the A sages numbered 40 are provided, o ening into the upper chamber alorded by t e cap 26 and closed at the bottom by means of plate 8'. I have also provided three pasa sages numbered 42, all of which are open at their lower ends and two of which are closed at their upper ends by means of plate 10 while the third is closed by means of spring-pressed valve 44 mounted in this case 10 ona centrally located bolt 46 which serves to clamp -top plate, filter sheets and bottom plate together in assembled relation. It is obvio s that in this form of the invention the vter sheets are of circular form, each '1, shea' being provided with Six radially grouped perforations 40, 42, as indicated on While my filter has been especially de signed for service in connection with lubrim eating systems of automobile engines, it is obvious that it is of general utility for the filtering of fluids.

It is especially. adapted for automobile use in that the lter body is readily removable and is composed of cheap materials making it practicable for the lowest priced cars to be equipped with an oil filter.

I claim:

1. A ilter unit comprising a filter body comprising a stack of sheets of fibrous materia-l, a casing for said body divided into two compartments, said body fitting in spaced relation in the casing to provide an annular passage thereabout in one of 85 said compartments, said body having a plurality of longitudinally extending passages communicating with the other of said compartments, the fluid in travelling from one compartment to the other passing 4.0 through said body in a direction substantially transverse to its axis.

2. The combination of a filter. body, a longitudinal passage -through said body, through which fluid is supplied to the filter,

a passage for recneiving filtered fluid, the

fluid in passing through the filter from one passage to the other following a direction substantially transverse to the axis of the body, and a normally closed pressure relief valve at one end of said longitudinal pas- 00 outlet ports for said container, all of said passages extending lin the same general direction and closed at one end, the closure for one set of passages forming a by-pass valve to permit the passage of Huid when the filter 05 is not functioning.

f 4. Ina iuid filter comprising a container a. cap for said container, a member secure between said cap and container, a filtering medium suspended from said member, a plurality of passages in lsaid medium to permit the flow of fluid, inlet and outlet ports to said container, and a bolt passing throu h said filtering medium and forming t e means for securing said filtering medium to said member.

5. The invention of claim 4, some of said passages having a byass interrelated therewith to permit the ow of duidl when the filter is not functioning.

6. The invention of claim 4, some of said passages having a resilient member placed thereover forming a by-pass to permit the iiow of Huid when the filter is not functioning, said resilient member having ads attached thereto which pads cover t e openings at the ends of the passages. r

In a iiuid filter comprising a container a cap for said container, a member secure between said cap and container, a filtering medium suspended from said member, a plurality of passages in said medium to permit the flow of duid, and inlet and outlet ports to said container, some of said passages having a by-pass interrelated therewith to permit the flow of liuid when the filter is not functioning.

8. In a fluid filter comprising a container, a cap for said container, a member secured between said cap and container, a ltering medium suspended from said member, a plurality of passages in said medium to permit the flow of Huid, inlet and outlet ports to said container, a resilient member placed over some of said passages forming a `bypass to permit the low of fluid when the lilter is not functioning, and pads attached to said resilientmember and covering the openings at the endslof the passages.

In testimony' whereof I aix my signature.

THERON P. CHASE. 

